Application of novel constrained friction processing method to produce fine grained biomedical Mg-Zn-Ca alloy
在线提供 19 October 2023
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Ting Chen, Banglong Fu, Junjun Shen, Uceu F.H.R. Suhuddin, Björn Wiese, Yuanding Huang, Min Wang, Jorge F. dos Santos, Jean Pierre Bergmann, Benjamin Klusemann
Abstract
In order to obtain Mg alloys with fine microstructures and high
mechanical performances, a novel friction-based processing method, name
as “constrained friction processing (CFP)”, was investigated. Via CFP,
defect-free Mg-Zn-Ca rods with greatly refined grains and high
mechanical properties were produced. Compared to the previous as-cast
microstructure, the grain size was reduced from more than 1 mm to around
4 µm within 3 s by a single process cycle. The compressive yield
strength was increased by 350% while the ultimate compressive strength
by 53%. According to the established material flow behaviors by “tracer
material”, the plastic material was transported by shear deformation.
From the base material to the rod, the material experienced three
stages, i.e. deformation by the tool, upward flow with additional tilt,
followed by upward transportation. The microstructural evolution was
revealed by “stop-action” technique. The microstructural development at
regions adjacent to the rod is mainly controlled by twinning, dynamic
recrystallization (DRX) as well as particle stimulated nucleation, while
that within the rod is related to DRX combined with grain growth.